Aquino signed with the Colorado Rockies as an international free agent on July 2, 2009. He spent his first professional season with the Dominican Summer League Rockies in 2010, posting a 4–3 win–loss record, a 1.02 earned run average (ERA), and 59 strikeouts in 61​2⁄3 innings pitched. He also played the 2011 season with the DSL Rockies, and pitched to an 8–2 record, 1.30 ERA, and 80 strikeouts in 89​2⁄3 innings. In 2012, Aquino pitched for both the DSL Rockies and the Rookie Grand Junction Rockies, posting a combined record of 10–1, a 1.66 ERA, and 110 strikeouts in 108​1⁄3 innings.\n', '

2013 saw Aquino promoted to the Short-Season A Tri-City Dust Devils, and later the Class-A Asheville Tourists. In 14 starts comprising 87 innings, he would go 0–10 with a 4.34 ERA and 73 strikeouts. He was added to the Rockies\' 40-man roster on November 20, 2013. In 2014, Aquino played with the Advanced-A Modesto Nuts and the Double-A Tulsa Drillers, posting a combined 5–10 record, a 5.13 ERA, and 83 strikeouts in 107 innings pitched. \n', '

He was designated for assignment by the Rockies on January 30, 2015, and traded to the Toronto Blue Jays for Tyler Ybarra on February 4, 2015. \n', '

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